Truck starts when cold but not when hot

Replace the starter

 

Injector pump,when it's cold it builds fuel pressure to start,when it's hot it can't build enough fuel pressure to start.I had 2 like this.

 

Does it crank, and not start? Or no crank?

 

Hello. My truck use to do the same. Start when it's cold and refuses to start when it's hot unless I wait hours for it to cool down. I replaced the crankshaft sensor, changed my hand primer fuel pump, change the main fuel pump, checked all my fuel lines. None of that solved the problem. Now my truck is refusing to start cold or hot. I have to remove my boost sensor from the manifold and spray something flammable inside it and the truck would start. The truck has lost some power but it still drives for as long as it is start. No diesel comes back throuh the return line to my fuel tank. The truck is telling me fuel pressure feed low mechanical fault. It's a 2005 Volvo FM12 D12 engine. HELP please if someone knows this problem

 

Had a similar problem here. Wired in a direct starter button to the starter solenoid. We were in a bind and it worked. Then it would not start after loading tanker with fuel on the rack. Another expensive wrecker bill at 3 AM.
That was the only truck like that here but it belonged to a large company. They said it has happened before. Replace the starter. It had a sensor hid on the back side we could not see. New starter no more problems. It could have been a Paccar engine.